Google MapsMap view of Valley Street in Maplewood, where reported police activity shut down NJ Transit passing by for more than an hour.

MAPLEWOOD — A bomb threat at a residential unit along the Morris/Essex commuter rail line in Maplewood led to the shutdown of train traffic in both directions for more than an hour and the evacuation of a small number of residents, officials said.

The threat was called in to a multi-family dwelling on the north side of Valley Street at approximately 6:45 p.m. today, said Sgt. Craig Lahey, a Maplewood Police Department spokesman.

No bomb was found, and a small number of residents that had been evacuated were allowed back into the building at about 9:30 p.m., Lahey said.

The Essex County bomb squad and bomb technicians from the FBI responded to the scene, Lahey said.

The incident caused rail traffic to be halted beginning at 7:34 p.m., NJ Transit spokesman Dan Stessel said. A total of eleven trains between Maplewood and South Orange were held up, including express service to New York City.